Megalomma elegans Smith, 1873:406 - Amarante, 2002Amarante, S.T.P. 2002. A synonymic catalog of the neotropical Crabronidae and Sphecidae (Hymenoptera: Apoidea). Arquivos de Zoologia (São Paulo) 37:1-139.:16 ( listed as synonym of Megistommum procerum (Handlirsch, 1888)).
Gorytes procerus Handlirsch, 1888:518, ♀ Replacement name for Megalomma elegans Smith, 1873 by Handlirsch, 1888Handlirsch, A. 1888. Monographie der mit Nysson und Bembex verwandten Grabwespen III. Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Classe 97:316-565.:518. - Handlirsch, 1888Handlirsch, A. 1888. Monographie der mit Nysson und Bembex verwandten Grabwespen III. Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften, Mathematisch-Naturwissenschaftliche Classe 97:316-565. (distribution); Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (distribution). - As Megistommum procerum: - Amarante, 2002Amarante, S.T.P. 2002. A synonymic catalog of the neotropical Crabronidae and Sphecidae (Hymenoptera: Apoidea). Arquivos de Zoologia (São Paulo) 37:1-139. (distribution); Rasmussen & Asenjo, 2009Rasmussen, C. & A. Asenjo 2009. A checklist to the wasps of Peru (Hymenoptera, Aculeata). ZooKeys 15:1-78. (distribution). - As Megistommum procerus: - Silvestre et al., 2014Silvestre, R., M.F. Demétrio, B.M. Trad, F. Varussa & O. Lima 2014. Diversity and distribution of Hymenoptera Aculeata in Midwestern Brazilian dry forests. In: Greer, F.E. (Ed.). Dry Forests. 29-80. (distribution).